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<article>
    <h2>LiveScript mode</h2>
    <form>
        <textarea id="code" name="code"> # LiveScript mode for CodeMirror # The following script, prelude.ls, is used to # demonstrate LiveScript mode for CodeMirror. # https://github.com/gkz/prelude-ls export objToFunc = objToFunc = (obj) -> (key) -> obj[key] export each = (f, xs) -->
            if typeof! xs is \Object for , x of xs then f x else for x in xs then f x xs export map = (f, xs) --> f = objToFunc f if typeof! f isnt \Function type = typeof! xs if type is \Object {[key, f x] for key, x of xs} else result = [f x for x in
            xs] if type is \String then result * '' else result export filter = (f, xs) --> f = objToFunc f if typeof! f isnt \Function type = typeof! xs if type is \Object {[key, x] for key, x of xs when f x} else result = [x for x in xs when f x] if
            type is \String then result * '' else result export reject = (f, xs) --> f = objToFunc f if typeof! f isnt \Function type = typeof! xs if type is \Object {[key, x] for key, x of xs when not f x} else result = [x for x in xs when not f x] if
            type is \String then result * '' else result export partition = (f, xs) --> f = objToFunc f if typeof! f isnt \Function type = typeof! xs if type is \Object passed = {} failed = {} for key, x of xs (if f x then passed else failed)[key] = x
            else passed = [] failed = [] for x in xs (if f x then passed else failed)push x if type is \String passed *= '' failed *= '' [passed, failed] export find = (f, xs) --> f = objToFunc f if typeof! f isnt \Function if typeof! xs is \Object for
            , x of xs when f x then return x else for x in xs when f x then return x void export head = export first = (xs) -> return void if not xs.length xs.0 export tail = (xs) -> return void if not xs.length xs.slice 1 export last = (xs) -> return
            void if not xs.length xs[*-1] export initial = (xs) -> return void if not xs.length xs.slice 0 xs.length - 1 export empty = (xs) -> if typeof! xs is \Object for x of xs then return false return yes not xs.length export values = (obj) -> [x
            for , x of obj] export keys = (obj) -> [x for x of obj] export len = (xs) -> xs = values xs if typeof! xs is \Object xs.length export cons = (x, xs) --> if typeof! xs is \String then x + xs else [x] ++ xs export append = (xs, ys) --> if typeof!
            ys is \String then xs + ys else xs ++ ys export join = (sep, xs) --> xs = values xs if typeof! xs is \Object xs.join sep export reverse = (xs) -> if typeof! xs is \String then (xs / '')reverse! * '' else xs.slice!reverse! export fold = export
            foldl = (f, memo, xs) --> if typeof! xs is \Object for , x of xs then memo = f memo, x else for x in xs then memo = f memo, x memo export fold1 = export foldl1 = (f, xs) --> fold f, xs.0, xs.slice 1 export foldr = (f, memo, xs) --> fold f,
            memo, xs.slice!reverse! export foldr1 = (f, xs) --> xs.=slice!reverse! fold f, xs.0, xs.slice 1 export unfoldr = export unfold = (f, b) --> if (f b)? [that.0] ++ unfoldr f, that.1 else [] export andList = (xs) -> for x in xs when not x return
            false true export orList = (xs) -> for x in xs when x return true false export any = (f, xs) --> f = objToFunc f if typeof! f isnt \Function for x in xs when f x return yes no export all = (f, xs) --> f = objToFunc f if typeof! f isnt \Function
            for x in xs when not f x return no yes export unique = (xs) -> result = [] if typeof! xs is \Object for , x of xs when x not in result then result.push x else for x in xs when x not in result then result.push x if typeof! xs is \String then
            result * '' else result export sort = (xs) -> xs.concat!sort (x, y) -> | x > y => 1 | x
            < y=> -1 | _ => 0 export sortBy = (f, xs) --> return [] unless xs.length xs.concat!sort f export compare = (f, x, y) --> | (f x) > (f y) => 1 | (f x)
                < (f y)=> -1 | otherwise => 0 export sum = (xs) -> result = 0 if typeof! xs is \Object for , x of xs then result += x else for x in xs then result += x result export product = (xs) -> result = 1 if typeof! xs is \Object for , x of xs then result
                    *= x else for x in xs then result *= x result export mean = export average = (xs) -> (sum xs) / len xs export concat = (xss) -> fold append, [], xss export concatMap = (f, xs) --> fold ((memo, x) -> append memo, f x), [], xs export
                    listToObj = (xs) -> {[x.0, x.1] for x in xs} export maximum = (xs) -> fold1 (>?), xs export minimum = (xs) -> fold1 (
                    <?), xs

export scan = export scanl = (f, memo, xs) -->
  last = memo
  if typeof! xs is \Object
  then [memo] ++ [last = f last, x for , x of xs]
  else [memo] ++ [last = f last, x for x in xs]

export scan1 = export scanl1 = (f, xs) --> scan f, xs.0, xs.slice 1

export scanr = (f, memo, xs) -->
  xs.=slice!reverse!
  scan f, memo, xs .reverse!

export scanr1 = (f, xs) -->
  xs.=slice!reverse!
  scan f, xs.0, xs.slice 1 .reverse!

export replicate = (n, x) -->
  result = []
  i = 0
  while i < n, ++i then result.push x
  result

export take = (n, xs) -->
  | n <= 0
    if typeof! xs is \String then '' else []
  | not xs.length => xs
  | otherwise     => xs.slice 0, n

export drop = (n, xs) -->
  | n <= 0        => xs
  | not xs.length => xs
  | otherwise     => xs.slice n

export splitAt = (n, xs) --> [(take n, xs), (drop n, xs)]

export takeWhile = (p, xs) -->
  return xs if not xs.length
  p = objToFunc p if typeof! p isnt \Function
  result = []
  for x in xs
    break if not p x
    result.push x
  if typeof! xs is \String then result * '' else result

export dropWhile = (p, xs) -->
  return xs if not xs.length
  p = objToFunc p if typeof! p isnt \Function
  i = 0
  for x in xs
    break if not p x
    ++i
  drop i, xs

export span = (p, xs) --> [(takeWhile p, xs), (dropWhile p, xs)]

export breakIt = (p, xs) --> span (not) << p, xs

export zip = (xs, ys) -->
  result = []
  for zs, i in [xs, ys]
    for z, j in zs
      result.push [] if i is 0
      result[j]?push z
  result

export zipWith = (f,xs, ys) -->
  f = objToFunc f if typeof! f isnt \Function
  if not xs.length or not ys.length
    []
  else
    [f.apply this, zs for zs in zip.call this, xs, ys]

export zipAll = (...xss) ->
  result = []
  for xs, i in xss
    for x, j in xs
      result.push [] if i is 0
      result[j]?push x
  result

export zipAllWith = (f, ...xss) ->
  f = objToFunc f if typeof! f isnt \Function
  if not xss.0.length or not xss.1.length
    []
  else
    [f.apply this, xs for xs in zipAll.apply this, xss]

export compose = (...funcs) ->
  ->
    args = arguments
    for f in funcs
      args = [f.apply this, args]
    args.0

export curry = (f) ->
  curry$ f # using util method curry$ from livescript

export id = (x) -> x

export flip = (f, x, y) --> f y, x

export fix = (f) ->
  ( (g, x) -> -> f(g g) ...arguments ) do
    (g, x) -> -> f(g g) ...arguments

export lines = (str) ->
  return [] if not str.length
  str / \\n

export unlines = (strs) -> strs * \\n

export words = (str) ->
  return [] if not str.length
  str / /[ ]+/

export unwords = (strs) -> strs * ' '

export max = (>?)

export min = (<?)

export negate = (x) -> -x

export abs = Math.abs

export signum = (x) ->
  | x < 0     => -1
  | x > 0     =>  1
  | otherwise =>  0

export quot = (x, y) --> ~~(x / y)

export rem = (%)

export div = (x, y) --> Math.floor x / y

export mod = (%%)

export recip = (1 /)

export pi = Math.PI

export tau = pi * 2

export exp = Math.exp

export sqrt = Math.sqrt

# changed from log as log is a
# common function for logging things
export ln = Math.log

export pow = (^)

export sin = Math.sin

export tan = Math.tan

export cos = Math.cos

export asin = Math.asin

export acos = Math.acos

export atan = Math.atan

export atan2 = (x, y) --> Math.atan2 x, y

# sinh
# tanh
# cosh
# asinh
# atanh
# acosh

export truncate = (x) -> ~~x

export round = Math.round

export ceiling = Math.ceil

export floor = Math.floor

export isItNaN = (x) -> x isnt x

export even = (x) -> x % 2 == 0

export odd = (x) -> x % 2 != 0

export gcd = (x, y) -->
  x = Math.abs x
  y = Math.abs y
  until y is 0
    z = x % y
    x = y
    y = z
  x

export lcm = (x, y) -->
  Math.abs Math.floor (x / (gcd x, y) * y)

# meta
export installPrelude = !(target) ->
  unless target.prelude?isInstalled
    target <<< out$ # using out$ generated by livescript
    target <<< target.prelude.isInstalled = true

export prelude = out$
</textarea></form>
    <script>
      var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
        theme: "solarized light",
        lineNumbers: true
      });
    </script>

    <p><strong>MIME types defined:</strong> <code>text/x-livescript</code>.</p>

    <p>The LiveScript mode was written by Kenneth Bentley.</p>

  </article>